<html>
<body style="margin: 100px">
<!--Outline around an empty span: WebKit does nothing here, as empty inlines are ignored.-->
<p>
<span style="outline: solid red 50px"></span>
<br>
<br>

<!--Outline around a span with a line break:-->
<p>
<span style="outline: solid green 50px"><br></span>
<br>
<br>
<br>
<br>
<br>

<!--Outline around a span with a line break and an 'x':-->
<p>
<span style="outline: solid blue 50px"><br>x</span>
<br>
<br>
<br>
<br>
<br>
<br>

<!--Outline around a span with an 'x' and two line breaks:-->
<p>
<span style="outline: solid purple 50px">x<br><br></span>
</body>
</html>
